This is the story behind the couple. Read the story first and watching:

The lady in her 30s was a dancer and was trained as one since she was a little girl.

Later she got into some kind of accident and lost her entire left arm.
She was depressed for a few years.
It seemed that someone asked her to coach a Children's dancing group.
From that point on, she realized she could not forget dancing.

She still loved to dance and wanted to dance again.

So she started to do some of her old routines.

But by her losing an arm, she also lost her balance. It took a while before she could even making simple turns and spins without falling. Eventually she got it.

Then she heard some guy in his 20s had lost a leg in an accident.
This guy also fell into the usual denial, depression and anger type of emotional roller coaster. She looked him up and persuaded him to dance with her. He had never danced.

And to dance with one leg? No way.

But she didn't give up and he reluctantly agreed. She started to teach him dancing 101.

The two broke up a few times because the guy had no concept of using muscle, control his body and a few other basic things about dancing. They hired a choreographer to design routines for them.

She would fly high (held by him) with a sleeve for an arm flying in the air.
He can bend horizontally supported by one leg and she leaning on him, etc.
They danced beautifully and they legitimately beat others in the competition.